statistics

I'm trying to determine if these two groups of data are equivalent. How do I show that mathematically? I have conducted an experiment in which three samples were each measured at two time points as shown in the image. I would like to compare these data and demonstrate (with some sort of...

I have learnt that the life table function nLx is the number of "person-years" lived by the cohort between ages x and x+n. But for stationary population, nLx is defined as the number of persons in the population who at any moment are living within the age interval (x, x+n). I don't...

Hi, I am currently conducting a short research paper for my university course and am struggling to determine which statistical analysis would be appropriate for the data I have collected. I surveyed two groups of 50 people: 50 x people aged 40 and over 50 x people aged under 40 My hypothesis...

Hello, I am working on developing on a standardised score from a number of scores. The values will be ranging from large to small of each score and I am trying to develop a way of proportionally measuring different data sets. I have something at the moment which is: (x1/largest x in dataset1)...

Hello, I'm doing data analysis research and currently I'm trying to fit the simple model to a data sample. From physical speculations I know that the distribution should be a sum of two normal distributions with different parameters (mean, width, area). I fitted my data with the model and it...

Roll a dice five times. Record the results in Sample 1. Repeat the experiment for Sample 2, 3, and 4. In a live classroom setting, actual survey data is used. In this knowledge check online environment, please use the following data: Sample 1 Sample 2 Sample 3 Sample 4 2 4...

I have data for 100 different biomarkers. Each biomarker has data for 4 groups (A,B,C,D) with ~2000 observations in each group. I've read a lot about ANOVA but I'm not looking for a difference in means, only a difference in variances between the 4 groups, for each biomarker. I know there is the...

Any chance anyone knows the answer to this? I know it's not paired t-test but don't know which of the others it is A hotel manager would like to test whether the average time taken for customers to complete the hotel's online booking form is less than 5 minutes. She selects a sample of 40...

OK, someone recently asked me what the probability that followers of Twitter handle X are also followers of Twitter handle Y. I used some R code (using the twitteR package) to get 47,000 followers from X and 61,000 followers of Y (the two handles have a LOT of followers). I created a vector and...

I am not really sure how to calculate question C. Can anyone help me out? Thanks in advance!

Alright, I have been working on my statistics assignment since Monday and I only have two questions left, dealing with the probability of a sampling error. Unfortunately, I cannot find anything in my notes and only a brief example in my textbook that does not explain the concepts behind the...

The govt. of ontario decided it would try to raise money by installing photo radar cameras on the 401 highway acros the top of Toronto. The camera would be set to record the speed of those travelling more that 135 km/h and send them a ticket for $200. It would only run the program between the...

Hi everyone, I'm currently working on my master dissertation. It is about the adoption of new products (COCA COLA PRODUCS). These are 26 new products. I need to determine which makes a foodservice business adopt the new products. I also have variables, such as environment of the business...

I am looking to create some useful statistics for the company I work for. I posted another question with a similar format for a specific regression analysis question, however, this question is different. I have a dataset that includes company name, company type, service provided, charge for the...

Apologies if this is a basic question, but my stats is very rusty these days! Background: I'm looking at a procedure that automates FISH analysis in a genetics diagnostics laboratory. I am currently running 7 patients that are negative controls (known normal patients) on the automated system to...

Hi all, STATWORX is a data science and statistics consulting company, located in Frankfurt Germany. Currently, we are looking for entry level and experienced data scientists. You can find our job offerings in our data science consulting page (German language). Feel free to apply to any of our...

Here is the question: How does the return distribution relate to the normal distribution if the return horizon becomes longer? :yup:

Hi All I am doing the MBA program. We have stats in our syllabus. I have strong mathematics background, however, I am not finding enough books to practice stats from. The questions we get aren't direct. We always get questions with a data set, which we solve using Excel/Data...

Please please help me! Hello there :) It's probably really straight forward but I'm having a very hard time trying to find a relationship between variables. I have an variable (Self-esteem) and I'm trying to assess whether there is a causal relationship between low self-esteem and if they...

Hi guys, I'm needing help with figuring out my results for logistic regression, I have to get this in to my supervisor in 6 hours and I'm freaking out! I'm sure it'd be easy as pie for someone who knows the basics.. I've never been good with statistics, if anyone is willing to help can you...